Thomas Lake Dam is an earth dam located in Hancock County, Illinois, built in 1975. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 260 ft long, taller than 50% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Thomas Lake Dam
The primary purpose of Thomas Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Loren Thomas (private). It impounds the Trib Rock Creek near Webster-offstream.
The dam stands 25 feet tall and stretches 260 feet across, and has a maximum storage capacity of 61 acre-feet. Completed in 1975, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 04/08/2024.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Hancock |
| Nearest City | Webster-offstream |
| River/Stream | Trib Rock Creek |
| Coordinates | 40.48058, -91.07325 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 260 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 61 acre-ft |
| Max Storage | 61 acre-ft |
| Normal Storage | 37 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Loren Thomas |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 04/08/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL01168 |
| Federal ID | IL01168 |
| More Info | State Dam Safety Program |